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1997 Jeep Wrangler Hesitation

Tiny
STEVENWERTH
  • MEMBER
  • 1997 JEEP WRANGLER
  • 4 CYL
  • 4WD
  • MANUAL
  • 125,000 MILES
IN my 97 Wrangler 2.5l Manual Trans, When I start to drive (EVERY time) I get about a 1/4 mile and it hesitates, hot or cold. If I keep accelerating it just stalls (doesn't kill the engine). Once I let off the accelerator and clutch and them pump the accelerator it kicks back in and doesn't do it again until I turn off the car and then drive it again.

I have Changed both O2 sensors, new manifold, new plugs and wires, and replaced the MAP sensor.

Any suggestions on what this might be?

Thanks
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Wednesday, December 3rd, 2008 AT 4:47 PM

18 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Do you have, or have you had, A check engine light recently? I would be suspicious of the throttle position sensor, but a little more information will help narrow it down. Please advise.
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Wednesday, December 3rd, 2008 AT 9:23 PM
Tiny
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The check engine light will come on periodically and stay on a couple days and then go off for about a week, then repeats.
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Thursday, December 4th, 2008 AT 9:56 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
What ever is tripping your check engine light could be a valuable clue to your problem. Auto Zone, and most moast other parts stores will scan your computer for free. If you will have this done and let me know comes up, we can go from there. Please advise.
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Thursday, December 4th, 2008 AT 11:24 AM
Tiny
STEVENWERTH
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Actually, I bought one online that I think is going to help. It should be here today. I will wait for the check engine light to come on and then let you know what the code is. I have to say, this is a GREAT resource for help. Thanks for this service.
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Thursday, December 4th, 2008 AT 12:11 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
All the moderators here enjoy sharing experience, not only with the posters, but with each other. What ever tripped your check engine light will be stored in the computer's memory. You can scan the memory any time, even if the CEL is not on.
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Thursday, December 4th, 2008 AT 5:15 PM
Tiny
STEVENWERTH
  • MEMBER
  • 10 POSTS
I used the ignition ON-OFF ON-OFF ON mode and it gave me the following codes:

22: Engine coolant temperature sensor above or below acceptable voltage.

12: Direct battery input to PCM was disconnected within the last 50 Key-on cycles.

14: MAP sensor input above or below acceptable voltage. 5 volt output to MAP sensor open.

Interestingly enough I put a new MAP sensor in the other day and my diagnostic OBD machine said it was at 5 volts

When I hooked up the OBD machine I just got today, it gave me trouble codes:

P0118 (M)
Engine Coolant Temperature Circuit High Input
Engine coolant temperature sensor input above the maximum acceptable voltage.

P0108 (M)
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
MAP sensor input above maximum acceptable voltage.
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Thursday, December 4th, 2008 AT 5:38 PM
Tiny
JAMES W.
  • MECHANIC
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I would go ahead and change the temp sensor, clear all the codes and see what comes up in the next day or two. The CTS input will have a bearing on map sensor processing. Let me know.
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Thursday, December 4th, 2008 AT 6:21 PM
Tiny
STEVENWERTH
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Where is the Temp Sensor?

I just took it for a drive with the ScanGuage installed.
The coolant temp leveled out at 195 degrees and the MAP was 5 PSI at Idle and maxed out around 13.5- 14 PSI at full accelleration. I read that up to 15 PSI is normal. I am not sure if this helps.
Thanks
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Thursday, December 4th, 2008 AT 6:23 PM
Tiny
JAMES W.
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Check to see what the temp sensor reads when you start it up cold.
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Thursday, December 4th, 2008 AT 6:51 PM
Tiny
STEVENWERTH
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I replaced the CTS and it still gives me the same trouble codes. The CEL is not lit but, I am still getting those same codes. So, I have replaced the MAP and CTS sensors and still nothing.
Thank you so much for the help so far.
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Thursday, December 4th, 2008 AT 9:19 PM
Tiny
STEVENWERTH
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The car temperature was 80 degrees at start-up. I changed the CTS Thursday and gave it the weekend and it still gives me the same 2 error codes. I am stumped.
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Monday, December 8th, 2008 AT 10:44 AM
Tiny
JAMES W.
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Lets see if your computer is telling us the truth. Clear all the codes and unplug the CTS, and take it for a spin. We'll see if sets a code. It may be a problem with the ECM. I'm always hesitant to blame the computer, but this may be an exception.
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Monday, December 8th, 2008 AT 1:32 PM
Tiny
STEVENWERTH
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I unplugged the CTS, cleared the codes, and then drove it. The check Engine Light came on. It was still giving me the same 2 codes. I got home and plugged the CTS back up and the CEL was still on and I still got the same 2 codes.
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Monday, December 8th, 2008 AT 3:26 PM
Tiny
JAMES W.
  • MECHANIC
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One more check. Unplug the throttle position sensor. Stsrt the Jeep and just let it idle for 5-10 minuites and see if it sets a code.
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Wednesday, December 10th, 2008 AT 11:39 AM
Tiny
STEVENWERTH
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I replaced the Throttle Position Sensor with a new one and now I get the same 2 errors plus, P0123 now.
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Tuesday, December 16th, 2008 AT 3:21 PM
Tiny
JAMES W.
  • MECHANIC
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The new code that was set, 0123, is for the TPS you just installed. I've noticed, all the components you have replaced "reading high". How much have you driven your jeep since we started on this little project. The reason I ask is, the ecm has to go through a relearn process to recalibrate itself to the new parts. It may not have completed it yet. I'm trying to find out how long this process is supposed to take, but it's a little confusing.
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Tuesday, December 16th, 2008 AT 8:34 PM
Tiny
STEVENWERTH
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I work from home so I am lucky to drive it a couple miles per day. I have noticed it runs better but, it still hesitates, just not as hard.
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Friday, December 19th, 2008 AT 7:10 PM
Tiny
JAMES W.
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Let me know what transpires in the next couple of days.
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+1
Friday, December 19th, 2008 AT 8:06 PM

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